Via the graphical user interface

Select Internet Protocol Version 4 (TCP/IPv4), then click on Properties.

Click on Use the following IP address and type in your server’s primary IP, subnet mask and default gateway information obtained by using the ipconfig command above. In the "Preferred DNS Server" box, type 213.186.33.99.

Be careful – the server will no longer be accessible if you enter incorrect information. You will then have to make the corrections in Winrescue mode or via the KVM.

Then click on Advanced (still in the TCP/IP Settings).

In the IP Address section, click Add:

Type in your failover IP and the subnet mask 255.255.255.255.

Click on Add.

Your failover IP is now functional.

FreeBSD

Step 1: Determine the interface

Determine the name of your primary network interface. You can use the ifconfig command for this operation: